branches/5.1: Backport changes from branches/zip r2725

Simplify the autoinc initialization code. This removes the
non-determinism related to reading the table's autoinc value for the first
time. This change has also reduced the sizeof dict_table_t by sizeof(ibool)
bytes because we don't need the dict_table_t::autoinc_inited field anymore.

Bug#39830 Table autoinc value not updated on first insert.
Bug#35498 Cannot get table test/table1 auto-inccounter value in ::info
Bug#36411 Failed to read auto-increment value from storage engine" in 5.1.24 auto-inc
rb://16

dict/dict0dict.c

@@ -422,8 +422,7 @@ dict_table_autoinc_lock(
 }
 
 /************************************************************************
-Initializes the autoinc counter. It is not an error to initialize an already
-initialized counter. */
+Unconditionally set the autoinc counter. */
 
 void
 dict_table_autoinc_initialize(
@@ -433,7 +432,6 @@ dict_table_autoinc_initialize(
 {
 	ut_ad(mutex_own(&table->autoinc_mutex));
 
-	table->autoinc_inited = TRUE;
 	table->autoinc = value;
 }
 
@@ -447,32 +445,25 @@ dict_table_autoinc_read(
 				/* out: value for a new row, or 0 */
 	dict_table_t*	table)	/* in: table */
 {
-	ib_longlong	value;
-
 	ut_ad(mutex_own(&table->autoinc_mutex));
 
-	if (!table->autoinc_inited) {
-
-		value = 0;
-	} else {
-		value = table->autoinc;
-	}
-
-	return(value);
+	return(table->autoinc);
 }
 
 /************************************************************************
 Updates the autoinc counter if the value supplied is greater than the
-current value. If not inited, does nothing. */
+current value. */
 
 void
-dict_table_autoinc_update(
-/*======================*/
+dict_table_autoinc_update_if_greater(
+/*=================================*/
 
 	dict_table_t*	table,	/* in: table */
 	ib_ulonglong	value)	/* in: value which was assigned to a row */
 {
-	if (table->autoinc_inited && value > table->autoinc) {
+	ut_ad(mutex_own(&table->autoinc_mutex));
+
+	if (value > table->autoinc) {
 
 		table->autoinc = value;
 	}

dict/dict0mem.c

@@ -89,7 +89,7 @@ dict_mem_table_create(
 
 	mutex_create(&table->autoinc_mutex, SYNC_DICT_AUTOINC_MUTEX);
 
-	table->autoinc_inited = FALSE;
+	table->autoinc = 0;
 
 	/* The number of transactions that are either waiting on the
 	AUTOINC lock or have been granted the lock. */

handler/ha_innodb.h

@@ -72,13 +72,15 @@ class ha_innobase: public handler
 	int update_thd(THD* thd);
 	int change_active_index(uint keynr);
 	int general_fetch(uchar* buf, uint direction, uint match_mode);
-	int innobase_read_and_init_auto_inc(ulonglong* ret);
-	ulong innobase_autoinc_lock();
+	ulong innobase_lock_autoinc();
+	ulonglong innobase_peek_autoinc();
 	ulong innobase_set_max_autoinc(ulonglong auto_inc);
 	ulong innobase_reset_autoinc(ulonglong auto_inc);
-	ulong innobase_get_auto_increment(ulonglong* value);
+	ulong innobase_get_autoinc(ulonglong* value);
+	ulong innobase_update_autoinc(ulonglong	auto_inc);
+	ulong innobase_initialize_autoinc();
 	dict_index_t* innobase_get_index(uint keynr);
-	ulonglong innobase_get_int_col_max_value(const Field* field);
+ 	ulonglong innobase_get_int_col_max_value(const Field* field);
 
 	/* Init values for the class: */
  public:

include/dict0dict.h

@@ -178,8 +178,7 @@ dict_table_autoinc_lock(
 /*====================*/
 	dict_table_t*	table);	/* in: table */
 /************************************************************************
-Initializes the autoinc counter. It is not an error to initialize an already
-initialized counter. */
+Unconditionally set the autoinc counter. */
 
 void
 dict_table_autoinc_initialize(
@@ -196,12 +195,12 @@ dict_table_autoinc_read(
 				/* out: value for a new row, or 0 */
 	dict_table_t*	table);	/* in: table */
 /************************************************************************
-Updates the autoinc counter if the value supplied is equal or bigger than the
-current value. If not inited, does nothing. */
+Updates the autoinc counter if the value supplied is greater than the
+current value. */
 
 void
-dict_table_autoinc_update(
-/*======================*/
+dict_table_autoinc_update_if_greater(
+/*=================================*/
 
 	dict_table_t*	table,	/* in: table */
 	ib_ulonglong	value);	/* in: value which was assigned to a row */

include/dict0mem.h

@@ -405,10 +405,6 @@ struct dict_table_struct{
 	mutex_t		autoinc_mutex;
 				/* mutex protecting the autoincrement
 				counter */
-	ibool		autoinc_inited;
-				/* TRUE if the autoinc counter has been
-				inited; MySQL gets the init value by executing
-				SELECT MAX(auto inc column) */
 	ib_ulonglong	autoinc;/* autoinc counter value to give to the
 				next inserted row */
 	ulong		n_waiting_or_granted_auto_inc_locks;

row/row0mysql.c

@@ -2910,7 +2910,7 @@ next_rec:
 	/* MySQL calls ha_innobase::reset_auto_increment() which does
 	the same thing. */
 	dict_table_autoinc_lock(table);
-	dict_table_autoinc_initialize(table, 0);
+	dict_table_autoinc_initialize(table, 1);
 	dict_table_autoinc_unlock(table);
 	dict_update_statistics(table);